122857981 has 4 divisors (see below), whose sum is σ = 122884000. Its totient is φ = 122831964.

The previous prime is 122857921. The next prime is 122858033. The reversal of 122857981 is 189758221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 122857981 - 2¹¹ = 122855933 is a prime.

It is a super-2 number, since 2×122857981² = 30188166990792722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122857921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3711 + ... + 16108.

It is an arithmetic number, because the mean of its divisors is an integer number (30721000).

Almost surely, 2^122857981 is an apocalyptic number.

It is an amenable number.

122857981 is a deficient number, since it is larger than the sum of its proper divisors (26019).

122857981 is an equidigital number, since it uses as much as digits as its factorization.

122857981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26018.

The product of its digits is 80640, while the sum is 43.

The square root of 122857981 is about 11084.1319461652. The cubic root of 122857981 is about 497.1275038000.

The spelling of 122857981 in words is "one hundred twenty-two million, eight hundred fifty-seven thousand, nine hundred eighty-one".